Actuating mechanism for elevator safety devices.



H. F. GURNEY & W. M. GUMMISKEY.

AGTUATING MECHANISM FOR ELEVATOR SAFETY DEVICES.

APPLICATION FILED JULY 12, 1911.

Patented July 7. 1914.

ATTORNEY 7H NORRIS PETERS C0,. PHOTD-LITHO.. VIASHINGYDN. L1G.

UNTTE 2A2 PATN @FFTUE.

HOW'ARID F. GURNEY, OFHAGKENSAGK, NEW JERSEY, AND WILLIAM M. CUMIVIISKEY,

0F HONESDALE, PENNSYLVANIA, ASSIGNORS, BY DIRECT AND ASEIGN- MENI'S, TO GURNEY ELECTRIC ELEVATOR COMPANY, OF HONESDALE, PENNSYL- VANIA, A CORPORATION OF PENNSYLVANIA.

ACTUATING MECHANISM FOR ELEVATOR SAFETY DEVICES.

Specification of Letters Patent.

Patented July 7, 19141.

Continuation of application Serial No. 559,348, filed May 1, 1910. This application filed July 12, 1911. Serial No. 638,185.

To all whom it may concern Be it known that we, HOWARD F. GUR- NEY and lVILLIAM M. CUMMisnnY, citizens of the United States, and residents, respectively, of Hackensack, in the county of Hergen and State of New Jersey, United States of America, and of Honesdale, in the county of Wayne and State of Pennsylvania,United States of America, have invented certain new and useful Improvements in Actuating Mechanisms for Elevator Safety Devices, of which the following is a specification.

Our invention relates to actuating mechanisms for elevator safety devices or clutches such as are used to lock elevator-cars t0 the guides over which they run. Its object is to provide two or more centrifugally actuated devices which are arranged to automatically throw in the safety devices at different predetermined speeds of the car, and to so arrange the actuating devices that different ones of them may be operatively connected with the car safety device at different parts of the cars travel.

This application is a renewal of a former application for patent Serial No. 559,348 which was filed May 4, 1910.

o will describe our invention in the following specification and point out the novel features thereof in the appended claims.

teferring to the drawings, Figure 1 is a bottom plan View, partly in section, of a common type of elevator safety device in combination with which our invention may be used. In Fig. 2 we have shown diagrammatically an elevator-car and some of its connected parts, showing more than one governor for actuating the safety device, and an arrangement whereby one or more governors may be driven by the car. Fig. 3 is a side elevation of some of the parts which are shown in Fig. 2.

Like characters of reference designate corresponding parts in all of the figures.

10 designates an elevator-car and 11 its hoisting cable. 12, 12 are the guides over which the car is arranged to run and with which the safety device may engage to arrest the movement of the car.

is a frame Y of the elevator safety device. This is ar ranged to be a'llixed to the car and carries brackets 21 which rotatably support a wind ing drum 22. 23 a rope wound about this drum with one of its ends attached thereto. 24, 25 designate threaded shafts one of which is right-handed and the other left-handed. These fit into similar threads on the inside of the drum 22. ()n the outer ends of these shafts are wedge-shaped cams 26. 27, 27 designate gripping-jaws which are pivoted to the frame at 28 and are arranged to engage with the rails 12 over which the car runs. The inner ends of the gripping-jaws are provided with antifriction rollers 29 between which the cams 26 are arranged to act. The operation of this device is as follows: \Vhencvor the rope 23 is pulled so that it is unwound from the winding drum 22 and the drum is rotated thereby, the right and left-hand screws 24 and 25 will be forced outward and will force the wedges 26 between the antifriction rollers 29. Thus the inner ends of the gripping-jaws will be forced apart and the other ends will be forced against the guides 12 which will firmly clamp the elevator'car to the stationary guides and will bring it to rest. This is a common form of elevator safety device well known in the arts. We have briefly described it in order to more clearly show the operation of the present invention which we now describe.

30 designates a centrifugal governor. An endless rope 31. passes over its driving sheave 32 and under a sheave 33 near the bottom of the elevator well. A loop of this rope is carried under a sheave 42, the function of which will be pointed out later. The governor rope is thus in driving engagement with the sheaves 32 and 42. The sheaves 32 and 33 are set at one side of the elevator well, and one side of the rope loop may run directly between them. but the other side of the rope loop is carried out of alinement with the sheaves and over one or more deflecting pulleys 13 on the car. Thus a part of the governor rope is oblique to the path of travel of the car. Some part of the governor rope 31 is connected with the car by a light yieldable leaf spring lt. Thus it may be Seen that the governor 30 will be driven by the movement of the car and at a speed proportional to that of the car.

84:, 8 k designate clamping jaws which are so arranged that they may be thrown into engagement with the governor rope by the governor 30 whenever its speed and that of the car exceed apredetermined amount.

The movement of the car after the governor rope has been locked will disengage its connection 14 fro-m the car. The safety rope 23 is afiixed to the governor rope at 15 and runs between guide pulleys 16 so that a further movement of the car will cause a pull to be exerted upon the governor rope which will rotate the drum 22 and set the safety device in a manner which we have already described.

40 is another governor which is geared to a friction wheel ll. The sheave 412 is mounted upon a counter-shaft 43, one end of which is pivoted to the frame 44: of the governor 40. On its other endis aweight 45. A friction wheel 46 is connected to rotate with the sheave 42. The weight 45 has a tendency to hold the friction wheels 41 and 46 apart.

The peculiar arrangement of the governor rope which we have pointed out is such that as the car approaches the ends of its travel it will deflect a portion of the governor rope in consequence of which the loop between the driving sheaves 82 and 42 will be shortened. This will bring the friction wheels together, and thereby cause the governor 40 to be driven. This governor is either arranged to be rotated at a higher speed than that of the governor 30 or else it is so adjusted that it will actuate its clamps e7 at a lower speed than that at which the governor 30 acts.

From the above it may be seen that the governor 40 will actuate. the car safety device at a lower rate of speed of the car than will the governor 30. The latter is so connected that it will prevent the car from attaining undue speed during the intermediate parts of its travel, and may be set to act at comparatively high rates of speed, but the governor 4C0, which comes into action only when the car approaches the endsof its run, may be set to act at a much lower rate of speed of the car so that the car must run more slowly through these portions of its run or else have its movement automatically arrestedby the governor l0 and its connectedparts.

Obviously an elevator-car may be run safely at greater rates of speed in the intermediate portions of its travel than it can as it approaches the top and bottom of its run This invention'provides for the auto.

matic actuation of the car safety device at difierent speeds dependent upon the position of the car relative to the limits of its travel.

What we claim is.

1. An elevator-car, a safety device there for, and a plurality of speed governors each arranged to cause said safety device to be actuated, said governors being arranged to act at different speeds, only one of said governors being operative during the entire travel of the car. 7 2. An elevator-car, a safety device therefor, and a plurality of speed governors driven by the car each arranged to cause said safety device to be actuated, said governors being arranged to act at different speeds of the car, only one of said governors being operative during the entire travel of the car.

8. An elevator-car, a safety device there for, a speed governor driven by the car and arranged to cause said. safety device to be actuated when the car reaches a predetermined speed, a second governor arranged to cause the safety device to be actuated when the car is running at lower speeds, and means for driving said second governor when the car nears the ends of its travel.

4:. An elevator-car, a safety device thereon, a speed governor driven by the move ment of the car throughout its travel and arranged. to cause said safety device to be actuated when the car reaches a predetermined speed, a second governor arranged to cause the safety device to be actuated when the car is running at lower speeds, and means for causing the car to drive said second governor through the end portions of the cars run.

5. An elevator-car, a safety device thereon, a plurality of speed governors set to act at different speeds of the car and arranged to cause the car safety device to be actuated, a governor rope connected with the car, and means for causing a different number of said governors to be driven during different parts of the cars travel.

6. An elevator-car, a safety device thereon, a plurality of'speed'go-vernors set to act at different speeds of the car and arranged to cause the car safety device to be actuated, a governor rope connected with the car, said rope being obliquely disposed relative to the cars path of travel and arranged to be deflected thereby, said rope being in driving contact with one of the governors and arranged to drive more than one governor during the end portions of the cars travel.

7. An elevator-car, a safety device thereon, a pair of speed governors set to act at different speeds of the car and arranged to cause the car safety device to be actuated, d'r-ivin sheaves for the governors, gearing between one of said sheaves and its governames to this specification in the presence 01" nor, a frlction drive oonnectlon between the two subscribing witnesses.

other sheave and its governor, and a gover I'IO'WARD F. GURNEY. nor rope obliquely disposed relatively to the WILLIAM M. CUMMISKEY. 5 cars path of travel and arranged to be de- WVitnesses for Howard F. Gurney:

fleoted thereby to control said friction drive ERNEST W. MARSHALL, connection, said rope being connected with GERTRUDE NEUSER. the car and in driving contact with the gov- Witnesses for WVilliam M. Cummiskey: ernor sheaves. ANTHONY R. LITTLE,

10 In testimony whereof we have signed our CLARENCE R. CALLAWAY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0. 

